Drill-bit-rotating device.



Se. 1r. mmm @L LA. miams, 4DRILL BIT BQTATING DEVICE. Brunnen FILED Nov. :2"1, 191s; n

mente@ July 7,19%

Ha/vs mMM w n I 1,103,Qo2.V

elfe-rie @EN :anion GEORGE EGILinAN ANn LEE A; KNiGH'rs, or CLAREMONT, New HAMPSHIRE, As-

SIGNoRs, `BY MESNE ASSIGNMENTS, .To SULLIVAN MACHINERY COMPANY, or -BosToN,.-MASS,ACHUSETTS, A conPonArioN or MASSACHUSETTS.

DRILL-nrr-norA'rrNe nnvrcn Specification of lLettersulatent. I

Patented July 7, 1914.

` Application 1ed November 21, 1913. Serial No. 802,299.

To allwhom it may concern `Be it known that we,.(3`r1:oRG`El H. GILMAN and LEE A. LKNIGHTS, citizens of the United States, and residents of Claremont, Sullivan county, New Hampshire,'have invented an Improvement in Drill- Bit- Rotating Devices, of which the following description, in connection with the accompanying drawings, isa specicatiomlike characterson the drawings lrepresenting like parts.

, This inventionrelates to drill-bit'rotating devices for `roc-k drills, and more especially to rdevices for utilizing the recip-ro'cative movement ofthe rock drills piston for impart-ing a. step-by-step rotative movement tov the drillchuck.

Our invention, as 'herein shown and described, is embodied :in a rock vdri-ll of the hammertype, but it will .be understood that the invention is applicable toother types of rock drills as well. v

Our invention will be 'best understood by reference to the following specification, when taken in connection -with .the accompanying drawings of one `specific embodiment thereof, 4while its scope will be more particularly pointed outl ,in the appended claims.

In the drawingszfFigure -1 is a longitudiiLal sectional view of a 'rock drill of the hammer type, having a chuckrotating'mechanismembodying our invention; Fig.'2 is 'an enl..rged sectional'view'on line 2-2 lof Fig. l; and Fig. 3 is a sectional view, partly broken away, on 'line 3-3of Fig Referring to the drawings, andto the embodiment of our invention which 4we have selected `for illustration, we have there shown a rockv drill having a4 cylinder 4, within which is a ypiston '5, ywhose reciprocative movement is controlled by a valve 6, which it will be 'unnecessary here `to describe, since it forns no essential part of `our 'present invention. i Y

A rock-cutting drill-bit of any suitable form-may be supportedand actuated by the piston in any other'appropriate mannen'but -isherein:nonfrotatably held ina bushing 8, the lattenin turn being secured to a`-rotata` ble chuc'ki). This chuck isherein mounted `to 'turnin a sleeve `10,-constituting a cas-ing Asecured to the front Acylinder head v111, the latter in lturn ybeing secured to' the forward end of the cylinder. The forward yend of `tive the sleeve is herein provided with an in wardly extending shoulder or flange lf2, by which the chuck is held against longitudinal movement while being permitted to rot-ate. The sleeve l() is herein provided with a chamber 13, constituting a housing for the vclutch presently `to be described, which serves as a means automatically to rotate the drill., so that during the continued act-ion vof the pist-on hammer, the. drill will -be caused to execute a step-bystep rotative movement, and whereby, on movement of the piston in one direction, the latter is caused to turn through a partial rotation, while on movement in the opposite direction, it is free toA travel without such rota-v tive movement.

ln order that this partial rotatlve movement of the piston may act also to rot-ate the tool, the piston is here- '.in provided with a forward extension 1li,

which constitutes a hammer vbar adapted to strike the inner end of the drill-bit, and is provided with onel or more, herein two, grooves -or key-ways 15, which kare herein straight,-that is `to say, they extend parallel with the axis of the piston. ln sliding `engagement with these grooves, respectively,

there arealso provided fixed members uponthe chuck, such as keys 1G, so that while the reciprocatory movement of the piston rela- 19, which conform to the shape of, and have slidin g engagement with, the helical grooves, Vand are formed on or appropriately secured to aring 20, through which thehammer portion of the piston works or slides, during its reciprocatory movement. By `this means,

the ring 20 and hammer bar'of the piston are so connected'that as one is held against movement in one direction, the other will of necessity be 'obliged to turn correspondingly in the opposite direction during the'reciprocatory movement of the piston. ternal surface of the ring is herein smooth or cylindrical in form, and this circumferen- 5 tial surface coperates with one or more, 4 herein three, rolling bodies 2l, which may be and preferably are in the form of 4cylindrical of the inner member. Interposed betweeny the inner and outer members 2O and 22, is a retainer 24E, herein in the form of a ring constituting a cage provided with a plurality of slots 25 to receive the rollers 2l, respectively, and carry the latter to and fro as thel cage is oscillated. If desired, the outer member 22 may 'be held against rotation friotionally, but` is herein provided with a.

80 pair of teeth, or lugs, 26, engaging thecorresponding -depressionsfor ,recesses 27 provided in the forward end of the cylinder head 1l.- Any -appropriate yielding means may be provided tending to rotate the cage 24 in one direction, and thereby yurge the rollers v21 up the inclines of their respective concavities into gripping engagement with the opposed surfaces of the inner and outer members. In the present in'stan'ce, we have pressed pin 28, mounted to slide in a recess D 29 provided in a lug '30, projecting laterally from the cage 24. The outer end of this pin engages a wall 3l ofa recess 32, formed in the outer member 22 to receive the lug 30. The extent of this recess is such as to allow sufficient play of the lug, so that the cage will carry the rollers to and fro the required distance to cause their gripping engagement with, and disengagement from, the inner and outer members Herein the pin 2S is rovide'd'vvitlifartluced portion 38 encircled y a helicalv compression# spring '34, bearing at one end against the inner end ofthegrecess 29, and at its other end yagainst the head of the pin, therebyv serving to press the latter outwardly yagainst the wall 31, rand hence constantly. tending to turn the cage 24 in a clockwise direction.- v' 4The described mechanils I means to enforce a repeated turning of the piston when traveling. in one directiomwhile 'allowing it to returnl in a straight path. During the action of the tool, the drill-bit 65 being pressed 'against the work oifersaslight The eX-y rollers. These rollers' `are 4interposed bechosen to employ for this purpose a 'spring-A t constitutes resistance to the rotation, Whilethejpiston tends to move'in a straight line,'y-that` is to say, 'without'rv rotation.- On" its 'forward movement, therefore, throufh the engagementof itshelical grooves with the inner member or ring 20, it tends to rotate the latter in the-direction of the arrow shown or the, inner ring in Fig. 2, andthe rollers 21= are carried toward the deeper portionsl of their respective concavities, thus permitting free, unrestricted rotation of the, ring'20. Hence, there isI no ,tendency to rotate they hammer bar ,ektension of the piston. Onits return movement, however, the hammer bar extension tends to rotate the ring 20 clockwise, and since the rollers, upon. s uchmove` ment, become wedged in their cavities, they .1 grip the ring and hold it against rotation, thus enforcinga clockwise movement of the hammer bar extension 14, vchuck 9, bushing 8,and'drill-bit 7. y I

It will be observed that the described con-vl struction provides an extremelycompact rotating device, and,presenting,l as it does, t comparatively few Tand. simple, working parts, it is` extremely free from likelihood of breakage or disarrangement. y Furthermore, this construction provides an assemblage of, pa'rts, the principal elementsof'which, z'. e..fl t the piston', annularrotating member, the.' 5 chuck and tool,` are all united so that' 'they hav'e an intermittent, but vcontinued,-'rotaJ-l',4 tion in thesame direction, it being necesi sary only to provide clutching or friction' parts upon thelixed cylinder adapted alter-13` wo nately to engage 'and release'the rotating'I member,"to 'effect the .turning of'thedrill.'

The particular construction described, furthermore, avoids the necessity of placing devices for rotating the piston, vsuchV as .ariie bar or the like, within -the "tool cylinderI itself, thereby eliminating a frequent causi`r forbreakage. 4 f While we have herein shown' and described one specific embodiment of ourv^invention for illustrati-ve purposes, and 'have disclosed-1.. and discussed in detail the construction and arrangement incidental to one specific 'appliscation thereof,.it is to be understood that the inventionl is limited neither to the mere desV tails "or' relative arrangement of parts, nor

"to its specic `embodiment hereinshown,buiJ

that v'extensive deviations from the illus# ftratedfcrm or embodiment of the invention v maybe made, without departing fromv the principlesthereof.

1 Having thusdescribed our invention, what Y we4 claim Aand `desire, byLetters Patent to procure is:l c L fv m l.. In a rock drill, theecombination lwith-a cylinder.,"antLipiston, of a 4drill chuck, and meansforrotating said chuck, ,said means including yinner and outermembers one .of -which'is :prOvded with an inclined concavity andthe other with an opposed cylindrical 13p surfacd' a retainer interposed between said members, a rolling body carried by said retainer and interposed between said inner and outer members and cooperating with said cylindrical surface Iand concavity, yielding means tending to rotate said retainer and thereby urge said rolling body up the incline of said concavity into gripping .engagement with the opposed surfaces of'said inner and outer'members, and means for causing the reciprocation of said piston to impart a rotary movement to one of said members.

2. In a rockdrill, the ycombination with a cylinder and a pistonhaving a reduced forward extension, of a drill chuck, and means for rotating said drill chuck, said means including inner and outer members one of which is provided with an inclined concavity and the other with an opposed cylindrical surface, a retainer interposed between said members, a rolling body carried by said retainer and interposedbetween said inner and outer membersand coperating with said cylindrical surface and concavity, yielding means tending to rotate vsaid retainer and thereby urge said rolling body into gripping engagement with the opposed surfaces of said inner and outer members, said piston extension and inner memberbeing provided one with a helical groove and the other with a tooth engaging therewith, whereby the reciprocation of the piston extension imparts a rotary movement to said inner member.

8. In' a rock drill, the combination with a cylinder and pistonhaving a reduced forward extension, of a drill chuck, and means for rotating lsaid drill chuck, said means in- "clu'ding inner and outer members one of which is provided with a plurality of inclined concavities and the other with an opposed cylindrical surface, a ring constituting a. cage interposed between saidmembers,

a plurality of rolling bodies carried by said ring and interposed between said inner and outer members and cooperating with said cylindrical surface and concavities, yielding means tending to ,rotate said ring and thereby urge said rolling bodies. into gripping engagement with the opposed surfaces of said inner and outer members, saidpiston extension and inner member. being provided one with a helical groove and the other with a tooth vengaging therewithwhereby the reciprocation of the iston extension imparts an oscillatory movement to said 'inner mem.-

ber. y

4. In a roclr`drill, the combination with a cylinder and piston, of,v a drill-bit, and means 'for utilizing the reciprocative move-v ment of said piston to cause a step-by-step rotative movement to said drill-bit, said means including a, roller clutch having'a roller cage, a roller, l coperating members l engaged by said roller, yielding means tend-y ing to rotate saidcage in Jone direction thereby to cause gripping engagement of said clutch, and means operated by reciprocative movement of said piston fgr causing' rotation of one of said cooperating members,

5. In a rock drill, the combination with a cylinder and piston', of a drill-bit, and means' for utilizing the reciprocative movement of said piston to vcause a step-by-step' rotative movement of said drill-bit, said means including a roller clutch comprising one or more rolling bodies,a retainer for said body or bodies, and yielding means tending to rotate said retainer in one direction.

` 6. In a rock drill, the combination with a cylinder and piston, of a drill-bit, and means c for utilizing the reciprocative movement of said piston to cause a step-by-step rotative mot/ement of-said drill-bit, said means including a roller clutch comprising inner and outer members, one,y or more rollingl bodies engaging said members, `an intermediate member carrying said body or bodies, and a spring operatively interposed between said outer and intermediate members and tending constantly to rotate the latter in one direction.

.7. In a rock drin, the Ombinaaon with a cylinder and piston, of a drill-bit, and means for utilizing the reciprocative movement of said piston to cause a step-by-step rotative movement of said drill-bit, said means including a roller clutch comprising inner and outer members, ,one or more 'rolling bodies engaging said members, an intermediate member carrying said body or bodies and provided with alaterally projecting lug, the

louterl member being provided with a recess in which said lug is disposed, and a springpressed pm carried by said lug, engaging a wall of said recess'and/ tending to rotate said intermediate member in one direction.

In testimony whereof, we have signed our names to this specification, in the presence of two Vsubscribing witnesses. Y Y

GEORGE n, Gira/ian. LEE A.v KNIGIITS.

' Vlitnesses:

E. J. BURoI-IARD, C. J. JONES. 

